Improvement in eotaky valves foe steam engines



@eine tats atent @ffies PETER BLOOMSEURG, JE., ANI) JAMES MOLYNEUX, OF BORDENTOWN, NEW JERSEY, ASSIGNOES TO THE BORDENTOWN MACHINE COMPANY.

Letters Ptzlent IVO. 65,470, dated Imre 4, 1867.

@ligt Stimuli nient in in ilgrse grttirs gnent 'mit making gint nt tige anni.

T0 ALL WHOM Il MAY CONCERN:

Bc it known that we, JAMES MOLYNEUX and PETER BLOOMSBURG, J`r., of Bordentown, Burlington county, New Jersey, have invented an improved Rotary Valve for Steam Engines; and we do hereby declare the following to be a full, clear, and exact description of the saine, reference being had to the accompanying drawing and to the letters of reference marked thereon.

Our rotary valve consisting of two revolving disks and an intermediate stationary disk, the several disks having openings arranged in respect to cach other and to the ports of a cylinder, in the manner described hereafter. Our invention further consists of a device described hereafter, whereby the relative position of thc two revolving disks and the cutting oit` of the steam may be regulated at pleasure.

In order to enable others skilled in the art to make and use our invention, we will now proceed to describe its construction and operation, reference being had to the accompanying `drawing, in which- Figure 1 represents a vertical section of our improved rotary valve.

Figure 2, a. sectional plan on the line 1-2, tig. 1.

Figures 3 and 4, plan views.

`Figures 5 and 6, elevations; and

Figure 7, a modification of the invention.

Similar letters refer to similar parts throughout the several views.

A represents a` portion of the cylinder of a steam engine, a and a being the two steam ports, and b the exhaust port. On the cylinder is formed the steam-chest D, which in this instance is shown without a cover or inlet pipe for the admission of steam. 'D, E, and F are three disks, adapted to the circular interior of the' steam-chest. The lowest disk F is secured to a vertical spindle, G, and bears on the valve-face e ofthe cylinder, lthe under side of the disk having a recess, f, which serves as a continuation of the passage for the steam from the cylinder to the exhaust opening, as illustrated in iig. I. Through this lower disk F is an opening, it, ofthe form illustrated in figs. 3 and 4. The intermediate disk E has projections 2'2', adapted to-reeesses in the valvechest, as seen in iig. 3, so that it cannot turn, and has two segmental openingsl and j', of the form seen'iu figs. 3 land 4. The upper disk D is secured to a' tubular spindle, H, fitting snugly, but so as to turn freely on the spindle G; and on the tubular spindle slides a collar, I, the vertical position of which may be controlled'by a hand-lever, or it may be under the control of the governor of the engine. A pin, m, passes through this collar, through a spiral groove, n, in the tubular spindle, and through a vertical groove, g, in thel inner spindle G. The upper disk D has a segmental opening, f, similar to those referred to above. On imparting a rotary motion to the spindle G the two disks D` and F will revolve simultaneously. As seen in iig. I, steam is in the act oi' passing into the cylinder through the opening t of the disk D, openingj of the disk E, and opening L of thc disk F, and through the port a, while exhaust steam is passing from the cylinder' at the opposite side of the piston, through the port a', passa-gef, and exhaust port b. If thc spindle G be turned to the extent of halt` a complete revolution, the disks D and F will be in such a position that sten-in will be admitted through the openings t and h of the revolving disks, and the openingj of the intermediate disk to the port a', while it is exhausting through the port a. The reccssfis of such dimensions Athat it serves as an exhausting passa-gc during one movement ot the piston, the spindle G making a complete revolution for every revolution of the crank-shaft. As long as the opening t of the disk D is directly above the opening 7L, steam is` admitted during the entire length ot' one movement ofthe pist-on, but on depressing the collar I, its pin, guided by the vertical slot q in the spindle G, will so act on the spiral groove of the tubular spindle H as to turn the latter to anextent commensurate with that of the collars depression, the upper'disk D boing consequently turned so that its openingr t will be in advance of the opening L; hence the disk D will cover the openings in the intermediate disk E, the supply oi' steam will be cut ofi` from the cylinder before the piston arrives at the limit of each of its movements, and the point in the movement of the piston, where the steam is thus cnt nii', will depend upon the position ofthe collar I, which-can be adjusted to any point desired. In the modication illustrated in iig. 7,

the collar I is embraced and controlled by a nut, M, which has internal screw-threads adapted to external threads on the tubular spindle II. It will be evident that the collar I, and consequently the relative positions of the disks D and F may, by a suitable system of rods and levers, be placed under the control of the governor.

We claim as oui` invention, and desire to secure by Letters Patent- 1. A rotary valve, composed ot' the disk F, with its passa-ge j' and opening t, and the disk D with its opening t, in c-ombination with the within-described ports in the valve-face of theicylinder,` und the intermediete disk E, with its openings j and j', the whole being constructed and operating substantially as and for the purpose herein set forth. y

2. The disk F, :md spindle G, with its vertical slot g, in combination with the disk D, the tubular spindle H, and its spiral slot, and the adjustable collar I, the whole being arranged for altering the relative positions of the said disks, substantially as set forth.

Y In testimony whereof we have signed our names to this speciieation Vin the presence of two subscribing witnesses.

` PETER BLOOMSBURG, JR.,

Y JAS. MOLYNEUX. `tl'l'itn'esses HI HoWsoN,

JOHNAV WHITE. 

